Help . after publish the flow. I can not upload the text file (such as xxx.md) in the chat box , does anybody know why? (in cloud env)

[dailyer]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

in mac book open the cloud dify

steps:
1.I create a new chatflow test_upload_text

2.I set the upload file as "text"， in the feature setting

3.I test the text file upload in preview，upload file successfully.

4. I publish the flow

5.I go to the published url.

6.I test if the text file can be uploaded successfully.

7.found that I can only upload img, can not upload text file (xxx.md)

i drag the text file

i upload the img file

does any encountered the same problem, or what is wrong with my operation?

2. Additional context or comments

No response

[dailyer]

I found my problem, when I setting the file type , I did not choose the start node, must choose the start node ,then set the upload type